build

ci: update alpine to 3.21 #530

Job	Run time
validate	16s
test (alpine:3.17, alpine, false)	3m 35s
test (alpine:3.18, alpine, false)	3m 51s
test (alpine:3.19, alpine, false)	3m 54s
test (alpine:3.20, alpine, false)	3m 58s
test (alpine:3.21, alpine, false)	3m 56s
test (alpine:edge, alpine, true)	4m 5s
test (debian:bullseye-backports, debian, false)	4m 25s
test (debian:bookworm, debian, false)	11m 5s
test (debian:bookworm-backports, debian, false)	11m 32s
test (debian:trixie, debian, false)	12m 17s
test (debian:sid, debian, true)	6m 46s
test (ubuntu:20.04, debian, false)	16m 2s
test (ubuntu:22.04, debian, false)	5m 44s
test (ubuntu:23.04, debian, false)	28s
test (ubuntu:24.04, debian, false)	14m 17s
test (redhat/ubi8, rhel, false)	41s
test (fedora:38, rhel, false)	58s
test (fedora:39, rhel, false)	59s
test (fedora:40, rhel, false)	38s
test (fedora:41, rhel, false)	35s
test (centos:7, rhel, false)	44s
test (rockylinux/rockylinux:8, rhel, false)	54s
test (rockylinux/rockylinux:9, rhel, false)	44s
test (oraclelinux:8, rhel, false)	1m 21s
test (oraclelinux:9, rhel, false)	1m 0s
build	0s
	1h 54m 45s

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